Repair-boot



R. C. BIGHAM.

REPAIR BOOT. APPLICATION FILED JAN. II. 1919 Patented May 6, 1919.

IN V EN TOR. 772707642727 6. Bey/2am BY W ATTORNEYS.

REPAIR-BOOT. j

To all whom it may concern:

Be it known that I, RICHARD C. BIGHAM, a citizen of the United States,residing at Spokane, in the county of Spokane and State of Washington,have invented new and useful Improvements in Repair-Boots, of which thefollowing is a specification.

This invention relates to improvements in repair boots adapted to beinserted between the inner tube and the outer 'casin of a pneumatic tireto protect the inner tu e.

An object of this invention is to provide a novel type of prong which ispreferably in the form" of a staple of substantially uniform crosssection throughout the length of the stock of which the staple isformed, the

pointed portions projecting through the outer plies of the boot andthe'resulting open bight portions being embedded between the cementedplies. Thus each prong will consist of a pair of pointed ends and Iainthe number ofprongs but also reduce the cross secthus enabled to notonlyincrease tion of the prongs, thereby gaining in strength and at the sametime reducing the size of the holes in the casing resulting frominsertion of the prongs therein.

. A further object is to bend the staples between their pointed ends andtheirj'bights so that the open bent bights can lie between the plies ofmaterial of which, the boot is formed, the plies'of the boot beingcemented together both inside and. aboutflthe open bight portions.

My invention has many other features and objects which will be morefully described in connection with the accompanying drawing, and whichwill be more particularly pointed out in and by the appended claims.

In the drawing is a longitudinal sectional view Figure 1,

of my inof a boot embodyingthe features vention. v

i Fig. 2, is a plan view thereof.

Fig.3 is an enlarged cross sectional vlew.

Fig. 4, is a face view of one of the staples beforeit is bent.

Fig. 5, is an edge view thereof.

Fig. 6, is a side view of the staple after being bent.

Fig. 7 is a plan view thereof.

Fig. 8, is an edge view of the staple after the same has been bent.

Like characters of reference designate similar parts throughout thedifferent figures of the drawing.

Specification of Letters Patent.

As shown, 1 designates a boot, as a whole,::;- which is shown as beingformed. of five plies of sheet material, suitably cemented togetlien 5.7

. and numbered 2, 3, 4, 5 and 6, althouglrl,dogged not wish to belimited to thisspecific nam her. It will be seen that on the ends, theplies are successively reduced in. length to taper off the ends from themaximum thick; 'ness-of the boot to a minimum edge orna gin thickness.The same 'is true at .the

edges, the purpose being to protect the; ner tube from being pinched inabutmentj abreast of asharp abrupt-edge of the b,oot,, and the casing.Thus, I willuse letters-W76 and b to designatethe length oftihe major ormaximum thickness -'of the :boot, lengt wise thereof, and the letters 0andd to in dicate the width of the major thick-ness,.be.- tween whichlimits it is a feature of -myi1 7'5 vention to confine the prongs; ..I:1 Substantially equally spaced throughout, the area of the thick portionof- ;the-: boot, for insertion into the casing, is' a plurality 1 ofprongs indicated as a'whole atfi il lieseg 80 prongs, in the preferredform,-;are staples,-g and I will first refer to the specific formofjstaple used before further. describi1ig. my-, improved boot, as myimproved staple itself, as an article of manufacture, presents novfeatures. e V The pointed end portions 8,are o-jf ufli -i. cient crosssection toexercise', colle'cti v more thanadequate holding action; owinto the number of staples used. The points, 9b are sharpened, as at 9,-.so' that-theyiwill. readily enter the casing and' -yet form relatively reduced. sized openings thereimE-com-i paratively speaking.Thebight portion 5, the staple, indicated at 10, is flattened. so thatits edges will be knife edged, the purpose of which will presentlyappear. .On line marked 11, the bight portion of the staple is bent atsubstantially right angles to the pointed portions thereby disposing allof the flattened portion in a position to lie between the plies of theboot. By means of the knife edges with which the bight portions areprovided, the cemented plies between which the bight is disposed, arenot separated by abrupt edges and this fact greatly reduces the extentof air bodies which would otherwise be present between the plies afterthey are vulcanized. It. is well known that separation of vulcanizedplies, in a structure of this nature, invites friction and rubbing suchas will in time Patented may ,1919.- 1 Application filed Januar 11,1919.SerialNo.270,676. ii i 60 to boots now on the mar absolutely chew thefabric to pieces. In accordance with my invention, it is possible to sonearly-eliminate the presence of air bubbles as to render them nugatory.

As shown in Fig. l, the open bight bases 10, lie flat upon the ply 3,and the pointed portions 8, project through plies 4c, 5 and 6. Thus,there are a greater number of plies above than below the bight bases.The purpose of this arrangement is to stiffen the pointed ends as muchas possible by reason of their engagement with the three plies. Further,it is a feature of my invention to dispose the bights 10, facing thecrown portion 12 by reason of the fact that when a tire is blown up, thedraw is toward the crown, as regards the boot. This arrangement servesto strengthen the staples.

It is objectionable to separate the vulcanized plies of the boot withmetal, as the separated port-ions tend to work loose, and when thisworking loose defect starts, it generally continues until a considerableportion or area of. adjacent plies are free from each other and begin towork and .cause destructive friction. Especially is this true wheremetal of any extensive area is interposed between the plies.

Now while I propose to insert metal between the plies of the boot, andbecause of this fact, cannot wholly eliminate the 0b-- jection. still.because my staples are formed of stock of substantially uniform crosssection throughout its length, the defect is reduced to a minimum. Itwill be seen that in the space marked 13, the opposing plies may takethe cement so that they will only be actually separated by just thatarea of the flattened bight and the juncture ofthe opposing plies willbe united all around the bight. At this point, it will now be clear thatthe uniform disposition of the prongs throughout the area of the bootwill assist in holding the boot in firm connection with the.

casing thereby preventing any surface portion from rubbing and therebyheating and working loose. Thus the character of the prongs, togetherwith their disposition, combine to avoid one of the greatest objectionsIt is believed that the advantages and utility of my invention will befully under stood from the foregoing description. arm while I haveherein shown and described one form of my invention, I do not wish to belimited thereto except for such limitations as the claims may import.

I claim 1. A repair boot for-insertion between the inner tube and thecasing of a pneumatic tire, comprising in combination, a boot body, anda plurality of staples formed of stock of substantially uniform crosssection throughout its length and having their pointed ends projectingfrom said body 6 for insertion into the casing, the open bights of saidstaples being embedded in said body.

A boot for insertion between the inner tube and the casing of apneumatic tire, com- 7 prising in combination, a boot body formed of aplurality of plies of material suitably cemented together, and aplurality of staples formed of stock of substantially uniform crosssection throughout its length and ha ving theiupointed ends projectingthrough the outermost ply'for insertion into the casing, the open bightportions of said staples being bent at such an angle to the pointed endportions as to lie flat between said plies and be held in place by thecemented plies inside and about the limbs of the bent bight pout-ions.

' A repair bo'ot forinsertion between the inner tube and the casing of apneumatic tires, comprising in combination, a boot body 7 formed of aplurality of plies of material suitably cemented together, and aplurality oflstaples havingtheir pointed ends projecting through theoutermost plies for inser- '90 tion into the casing, the open bightportions of? said staples being bent to lie between the plies of theboot and the edges of said bi ht portions being chamfered to reduce theormation of air pockets, the adjacent plies be-

